Mercurial > hg > orthanc-stone

annotate Framework/Messages/IObserver.h @ 973:38409549db43 toa2019082903

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Log with addresses + added fingerprint mechanism to avoid calling zombie objects where: - a message is sent with a receiver - the receiver dies - another receiver with the SAME address is created - the message reply is executed --> execution on the wrong object! (since their "identity" is their address. The fix is to identify them with an UUID stored at creation time)
author Benjamin Golinvaux <bgo@osimis.io>
date Thu, 29 Aug 2019 18:07:55 +0200
parents b70e9be013e4
children e75fd08d6c75
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #pragma once
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23
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24 #include "MessageBroker.h"
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25 #include "IMessage.h"
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27 #include <Core/Toolbox.h>
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28
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29 namespace OrthancStone
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30 {
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31 class IObserver : public boost::noncopyable
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32 {
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33 private:
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34 MessageBroker& broker_;
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35 // the following is a UUID that is used to disambiguate different observers
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36 // that may have the same address
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37 std::string fingerprint_;
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38 public:
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39 IObserver(MessageBroker& broker)
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40 : broker_(broker)
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41 , fingerprint_(Orthanc::Toolbox::GenerateUuid())
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42 {
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43 LOG(TRACE) << "IObserver(" << std::hex << this << std::dec << ")::IObserver : fingerprint_ == " << fingerprint_;
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44 broker_.Register(*this);
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45 }
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46
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47 virtual ~IObserver()
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48 {
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49 LOG(TRACE) << "IObserver(" << std::hex << this << std::dec << ")::~IObserver : fingerprint_ == " << fingerprint_;
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50 broker_.Unregister(*this);
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51 }
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53 const std::string& GetFingerprint() const
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54 {
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55 return fingerprint_;
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56 }
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57
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58 MessageBroker& GetBroker() const
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59 {
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60 return broker_;
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61 }
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62 };
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63 }